3. A small radio transmitter broadcasts in a 50 mile radius. If you drive along a straight line from a city 60 miles north of the transmitter to a second city 70 miles east of the transmitter, during how much of the drive will you pick up a signal from the transmitter?
I am completely lost on how I'm supposed to go about solving this problem. The solution was provided with brief steps but I still couldn't wrap my head around it. Thank you!